[TYPO3-english] Why is my TS UserFunc not called?

[Sebastian Gebhard]

Lately i'm more and more in trouble with TS UserFuncs. They never want to run.. :/

I want to manipulate to displayed images of the textpic content element:

includeLibs.browsable_imgtextUserfunc = EXT:browsable_imgtext/Classes/UserFuncs.php
tt_content.textpic.20{
   imgList.postUserFunc = Tx_browsableimgtext_UserFuncs->getImgList
}

When I try to echo something in the userFunc it shows that it is not even called.

Where am I wrong?

Kind Regards